/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Allow for game specific override to determine if login should be treated as successful for pass-through handling instead
virtual bool IsLoginPIESuccessful ( int32 LocalUserNum, bool bWasSuccessful, const [FString](API\Runtime\Core\Containers\FString) & ErrorString, const [FPieLoginStruct](API\Editor\UnrealEd\FPieLoginStruct) & DataStruct )